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Official Study Guide (OSG) 10th Edition

Book · Prep courses, practice tests & platforms · 11 mentions · 1 subreddit · discussed in r/cissp

Reddit take

Not enough linked mention summaries yet; the source excerpts below are the evidence.

Pros

  • Read the Official Study Guide (OSG) once. ... Here’s what worked for me
  • I read the official study guide (OSG) front to back, took every chapter quiz, all above 80%, took all domain quiz 75-80% except domain 4.
  • Resources I used * Official Study Guide (OSG)
  • During the final two weeks, the OSG became my main reference source for validating concepts and clearing up difficult areas.
  • While the OSG seems overwhelming, it is easiest handled by breaking into manageable chunks, such as reading 1 chapter per day, 50 pages/day, etc.

Cons

  • Official Study Guide (OSG): 4/10 I tried reading this multiple times, but gave up halfway through. I only used it for chapter summaries and specific deep dives.
  • good call on not reading the osg cover to cover, that book is a beast.
  • you might want to purchase OSG but be aware it's long and dry!
  • Official Study Guide (OSG) — 3/10: Accessed via my employer's platform. Very dry and abstract. I abandoned it halfway through Domain 2.
  • Official Study Guide (OSG) 10th Edition (honestly feels overwhelming due to size)... The OSG feels more complete, but also heavy and harder to get through.

Sentiment

5 positive (45%) · 4 mixed (36%) · 2 negative (18%)

Trust + time weighted score: +27% · raw score 27%

What redditors said (10 of 11)

Read the Official Study Guide (OSG) once. ... Here’s what worked for me
positive · u/O****0 · r/cissp · Aug 28, 2026 · open on Reddit ↗ · attribution unverified
I read the official study guide (OSG) front to back, took every chapter quiz, all above 80%, took all domain quiz 75-80% except domain 4.
positive · u/O****6 · r/cissp · Aug 16, 2026 · open on Reddit ↗
Official Study Guide (OSG): 4/10 I tried reading this multiple times, but gave up halfway through. I only used it for chapter summaries and specific deep dives.
negative · u/c****e · r/cissp · Aug 8, 2026 · open on Reddit ↗
Resources I used * Official Study Guide (OSG)
positive · u/U****3 · r/cissp · Aug 4, 2026 · open on Reddit ↗
good call on not reading the osg cover to cover, that book is a beast.
mixed · u/l****g · r/cissp · comment · Jul 16, 2026 · open on Reddit ↗
During the final two weeks, the OSG became my main reference source for validating concepts and clearing up difficult areas.
positive · u/e****l · r/cissp · Jul 16, 2026 · open on Reddit ↗
you might want to purchase OSG but be aware it's long and dry!
mixed · u/t****1 · r/cissp · comment · Jun 18, 2026 · open on Reddit ↗
Official Study Guide (OSG) — 3/10: Accessed via my employer's platform. Very dry and abstract. I abandoned it halfway through Domain 2.
negative · u/J****0 · r/cissp · May 21, 2026 · open on Reddit ↗
While the OSG seems overwhelming, it is easiest handled by breaking into manageable chunks, such as reading 1 chapter per day, 50 pages/day, etc.
positive · u/m****8 · r/cissp · comment · Apr 20, 2026 · open on Reddit ↗
Official Study Guide (OSG) 10th Edition (honestly feels overwhelming due to size)... The OSG feels more complete, but also heavy and harder to get through.
mixed · u/O****5 · r/cissp · Apr 20, 2026 · open on Reddit ↗

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